#include <stdio.h>

int main(void)
{
	//希望统计班级成绩的总成绩和平均分
	int a1 = 80;
	int a2 = 90;
	int a3 = 78;
	int sum = a1+a2+a3;
	double avgScore = (double)sum/3;
	printf("sum:%d,avgScore:%.2f\n",sum,avgScore);
	return 0;
}
